Variable Interest Entities (Assets And Liabilities Of Consolidated VIEs) (Details) - USD ($)	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Variable Interest Entity [Line Items]
Cash	$ 2,604,066,000	$ 3,638,648,000	$ 3,524,524,000	$ 4,276,775,000
Financial instruments owned	15,543,455,000	18,500,445,000
Securities purchased under agreement to resell	3,526,686,000	3,854,746,000
Receivables	4,178,419,000	3,830,967,000
Loans to and investments in associated companies	1,843,470,000	1,757,369,000
Other	1,874,362,000	1,473,464,000
Total	43,134,365,000	46,331,184,000
Other secured financings	1,028,569,000	908,741,000
Long-term debt	7,620,461,000	7,400,582,000
Total liabilities	32,551,412,000	35,548,661,000
Noncontrolling interests	157,875,000	64,679,000
Securitization Vehicles [Member]
Variable Interest Entity [Line Items]
Cash	1,600,000	1,100,000
Financial instruments owned	79,100,000	68,300,000
Securities purchased under agreement to resell	878,100,000	717,300,000
Aircraft	0	0
Receivables	0	0
Loans to and investments in associated companies	0	0
Other	143,000,000	158,600,000
Total	1,101,800,000	945,300,000
Other secured financings	1,087,800,000	930,800,000
Long-term debt	0	0
Other	14,000,000	14,500,000
Total liabilities	1,101,800,000	945,300,000
Noncontrolling interests	0	0
Real Estate Investment Vehicles [Member]
Variable Interest Entity [Line Items]
Cash	1,700,000
Financial instruments owned	0
Securities purchased under agreement to resell	0
Aircraft	0
Receivables	123,300,000
Loans to and investments in associated companies	16,200,000
Other	9,300,000
Total	150,500,000
Other secured financings	0
Long-term debt	104,500,000
Other	1,700,000
Total liabilities	106,200,000
Noncontrolling interests	27,300
Airplane Financing Vehicle [Member]
Variable Interest Entity [Line Items]
Cash	0
Financial instruments owned	0
Securities purchased under agreement to resell	0
Aircraft	27,300,000
Receivables	0
Loans to and investments in associated companies	0
Other	0
Total	27,300,000
Other secured financings	0
Long-term debt	22,700,000
Other	1,700,000
Total liabilities	24,400,000
Noncontrolling interests	0
Jefferies [Member]
Variable Interest Entity [Line Items]
Secured financings eliminated in consolidation	$ 59,300,000	$ 22,100,000